JP6456259B2 - Overflow tube - Google Patents
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- JP6456259B2 JP6456259B2 JP2015145633A JP2015145633A JP6456259B2 JP 6456259 B2 JP6456259 B2 JP 6456259B2 JP 2015145633 A JP2015145633 A JP 2015145633A JP 2015145633 A JP2015145633 A JP 2015145633A JP 6456259 B2 JP6456259 B2 JP 6456259B2
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Description
本発明は、オーバーフローチューブに関する。 The present invention relates to an overflow tube.
自動変速機の変速機ケースの下部には、オイルを貯留するオイルパンが取り付けられており、オイルパンには、貯留されたオイルの高さを調節するためのオーバーフローチューブが設けられている（例えば特許文献１）。 An oil pan for storing oil is attached to the lower part of the transmission case of the automatic transmission, and the oil pan is provided with an overflow tube for adjusting the height of the stored oil (for example, Patent Document 1).
図４は、特許文献１に代表される従来例にかかるオーバーフローチューブを説明する図である。
図４の（ａ）に示すように、変速機ケース１００の下部に設けられたオイルパン１０１では、底壁部１０１ａに、オーバーフローチューブ１１０が取り付けられている。
FIG. 4 is a diagram illustrating an overflow tube according to a conventional example represented by Patent Document 1.
As shown to (a) of FIG. 4, in the oil pan 101 provided in the lower part of the transmission case 100, the overflow tube 110 is attached to the bottom wall part 101a.
図４の（ｂ）に示すように、オーバーフローチューブ１１０は、オイルパン１０１の底壁部１０１ａに設けられた支持部材１１１と、支持部材１１１に設けられていると共にオイルパン１０１の内部と外部を連通させる連通孔１１２と、連通孔１１２の開口をオイルパン１０１の外部から封止するボルトＢと、連通孔１１２を貫通して設けられた筒状部材１１４と、を有している。 As shown in FIG. 4B, the overflow tube 110 is provided with a support member 111 provided on the bottom wall portion 101a of the oil pan 101, the support member 111 and the inside and the outside of the oil pan 101. It has a communication hole 112 for communication, a bolt B for sealing the opening of the communication hole 112 from the outside of the oil pan 101, and a cylindrical member 114 provided through the communication hole 112.
連通孔１１２は、オイルパン１０１の内部に開口する小径孔部１１２ａと、オイルパン１０１の外部に開口する大径孔部１１２ｂとから構成されている。
筒状部材１１４は、小径孔部１１２ａの内径と整合する外径を有しており、小径孔部１１２ａを大径孔部１１２ｂ側から貫通させた先端部１１４ａを、オイルパン１０１内の所定位置に配置して設けられている。
The communication hole 112 includes a small-diameter hole portion 112 a that opens to the inside of the oil pan 101 and a large-diameter hole portion 112 b that opens to the outside of the oil pan 101.
The cylindrical member 114 has an outer diameter that matches the inner diameter of the small-diameter hole portion 112a, and a tip portion 114a that penetrates the small-diameter hole portion 112a from the large-diameter hole portion 112b side is set at a predetermined position in the oil pan 101. It is arranged and provided.
筒状部材１１４は、長手方向の一端部に、大径孔部１１２ｂの内径と整合する外径の大径部１１５を有しており、この大径部１１５の外周には雄ネジが形成されている。
筒状部材１１４は、大径部１１５の外周の雄ネジを連通孔１１２の内周の雌ネジに螺合させて、支持部材１１１に組付けられており、大径部１１５が、小径孔部１１２ａと大径孔部１１２ｂとの境界の段部１１２ｃに当接する位置まで螺入されると、筒状部材１１４の先端部１１４ａが、オイルパン内の所定の高さ位置に配置されるようになっている。
The cylindrical member 114 has an outer diameter large diameter portion 115 aligned with the inner diameter of the large diameter hole portion 112b at one end in the longitudinal direction, and a male screw is formed on the outer periphery of the large diameter portion 115. ing.
The cylindrical member 114 is assembled to the support member 111 by screwing the male screw on the outer periphery of the large-diameter portion 115 with the female screw on the inner periphery of the communication hole 112, and the large-diameter portion 115 is connected to the small-diameter hole portion. When the screw is inserted to a position where it contacts the step 112c at the boundary between 112a and the large-diameter hole 112b, the tip 114a of the cylindrical member 114 is arranged at a predetermined height in the oil pan. It has become.
ここで、自動変速機の組付けラインでは、連通孔１１２の開口がボルトＢで封止された支持部材１１１が、オイルパン１０１に溶接された状態で、オーバーフローチューブの組付け工程に供給されるようになっている。
そのため、オーバーフローチューブの組付け工程では、当該工程に用意された筒状部材１１４を、支持部材１１１に対して組付ける作業を行うようになっており、この組付け作業を実行する作業者は、（１）支持部材１１１の連通孔１１２（大径孔部１１２ｂ）からのボルトＢの取り外しと、（２）筒状部材１１４の大径部１１５の大径孔部１１２ｂへの螺入と、（３）大径孔部１１２ｂへのボルトＢの螺入による連通孔１１２の開口の封止と、を順番に行うことで、オーバーフローチューブ１１０の組付けが行われるようになっている。
Here, in the assembly line of the automatic transmission, the support member 111 in which the opening of the communication hole 112 is sealed with the bolt B is supplied to the overflow tube assembly process in a state where the support member 111 is welded to the oil pan 101. It is like that.
Therefore, in the assembly process of the overflow tube, the cylindrical member 114 prepared in the process is assembled to the support member 111, and the worker who performs this assembly work is (1) Removing the bolt B from the communication hole 112 (large diameter hole portion 112b) of the support member 111, (2) screwing the large diameter portion 115 of the cylindrical member 114 into the large diameter hole portion 112b, 3) The overflow tube 110 is assembled by sequentially sealing the opening of the communication hole 112 by screwing the bolt B into the large-diameter hole portion 112b.
そのため、筒状部材１１４を組付けるために、支持部材１１１（大径孔部１１２ｂ）からのボルトＢの取り外し作業と、支持部材１１１（大径孔部１１２ｂ）への取り付け作業が必要であり、オーバーフローチューブの組付け工程における作業工数が多いため、作業コストが高くなってしまう。
そこで、より簡単にオーバーフローチューブの組付けを行えるようにすることが求められている。
Therefore, in order to assemble the cylindrical member 114, it is necessary to remove the bolt B from the support member 111 (large diameter hole portion 112b) and attach it to the support member 111 (large diameter hole portion 112b). Since there are many work steps in the assembly process of the overflow tube, the work cost becomes high.
Therefore, it is required to make it easier to assemble the overflow tube.
本発明は、
オイルパンに設けられた支持部材と、
前記支持部材に設けられていると共に、前記オイルパンの内部と外部を連通させる連通孔と、
前記連通孔の開口を前記オイルパンの外部から封止する封止部材と、
長手方向の一端側が、前記オイルパンの内部側から前記連通孔に挿入されて、前記一端が前記連通孔の内部で前記封止部材に当接して位置決めされると共に、前記連通孔の外部に位置する他端が、前記オイルパン内の所定位置に配置された筒状部材と、を有するオーバーフローチューブであって、
前記筒状部材では、
前記長手方向の一端側に設けた大径部の外周に、前記連通孔の内周のネジ部に螺合するネジ部が設けられていると共に、
前記大径部の前記一端側に隣接して、前記長手方向に圧縮された際に拡径するビード加工部が、前記大径部よりも小さい外径で設けられており、
前記ビード加工部の前記拡径後の外径を、前記大径部よりも大きい外径に設定した構成のオーバーフローチューブとした。
The present invention
A support member provided on the oil pan;
A communication hole provided in the support member and communicating between the inside and the outside of the oil pan;
A sealing member for sealing the opening of the communication hole from the outside of the oil pan;
One end side in the longitudinal direction is inserted into the communication hole from the inner side of the oil pan, the one end is positioned in contact with the sealing member inside the communication hole, and is positioned outside the communication hole. The other end to be an overflow tube having a cylindrical member disposed at a predetermined position in the oil pan,
In the tubular member,
On the outer periphery of the large-diameter portion provided on one end side in the longitudinal direction, a screw portion that is screwed into the inner peripheral screw portion of the communication hole is provided,
Adjacent to the one end side of the large-diameter portion, a bead processing portion that expands in diameter when compressed in the longitudinal direction is provided with an outer diameter smaller than the large-diameter portion,
An overflow tube having a configuration in which an outer diameter of the bead processed portion after the diameter expansion is set to an outer diameter larger than that of the large diameter portion is used.
本発明によれば、筒状部材の一端が封止部材に当接する位置まで、オイルパンの内側から筒状部材を連通孔に螺入したのち、筒状部材を連通孔にさらに螺入すると、ビード加工部が、筒状部材の長手方向に圧縮されて、大径部よりも大きい外径まで拡径する。
これにより、拡径したビード加工部が連通孔の内周のネジ部と干渉して、筒状部材を連通孔からオイルパンの内側に引き抜く方向への移動が規制される。
これにより、筒状部材を支持部材に対して組付ける際に、支持部材からの封止部材の取り外し作業と、支持部材への封止部材の取り付け作業とを行う必要がなく、オーバーフローチューブの組付け工程における作業工数が少なくなるので、より簡単にオーバーフローチューブの組付けを行えることになる。
よって、作業工数が少なくなった分だけ、作業コストの低減が期待できる。
According to the present invention, after the cylindrical member is screwed into the communication hole from the inside of the oil pan to the position where one end of the cylindrical member contacts the sealing member, the cylindrical member is further screwed into the communication hole. The bead processed portion is compressed in the longitudinal direction of the cylindrical member and expands to an outer diameter larger than the large diameter portion.
As a result, the expanded beaded portion interferes with the threaded portion on the inner periphery of the communication hole, and movement in the direction of pulling the tubular member from the communication hole to the inside of the oil pan is restricted.
As a result, when the cylindrical member is assembled to the support member, there is no need to perform the operation of removing the sealing member from the support member and the operation of attaching the sealing member to the support member. Since the number of work steps in the attaching process is reduced, the overflow tube can be assembled more easily.
Therefore, it is possible to expect a reduction in work cost as much as the number of work steps is reduced.
以下、本発明の実施の形態を説明する。
図１は、実施の形態にかかるオーバーフローチューブ１を説明する図であり、（ａ）は、支持部材２への筒状部材３の組付けが完了した状態の断面図であり、（ｂ）は、（ａ）における領域Ａの拡大図であり、（ｃ）は、支持部材２への筒状部材３の組付け前の状態を説明する図であり、（ｄ）は、（ｃ）における領域Ｂの拡大図である。
Embodiments of the present invention will be described below.
FIG. 1 is a diagram for explaining an overflow tube 1 according to an embodiment, wherein (a) is a cross-sectional view of a state in which assembly of a cylindrical member 3 to a support member 2 is completed, and (b) (A) is the enlarged view of the area | region A, (c) is a figure explaining the state before the assembly | attachment of the cylindrical member 3 to the support member 2, (d) is the area | region in (c). FIG.
図１の（ａ）に示すように、オーバーフローチューブ１は、オイルパン８０の底壁部８０ａに固定された支持部材２と、支持部材２に設けられた連通孔２３の開口をオイルパン８０の外部から封止するボルトＢと、連通孔２３を貫通させた他端３１ｂを、オイルパン８０内の所定位置に配置させた筒状部材３と、を有している。 As shown in FIG. 1A, the overflow tube 1 includes a support member 2 fixed to the bottom wall portion 80 a of the oil pan 80 and an opening of the communication hole 23 provided in the support member 2. A bolt B that is sealed from the outside, and a cylindrical member 3 in which the other end 31 b penetrating the communication hole 23 is disposed at a predetermined position in the oil pan 80 are provided.
支持部材２は、円筒状の基部２１を有しており、この基部２１の一端２１ａは、底壁部８０ａを貫通して、オイルパン８０の外部に位置している。
基部２１の一端２１ａから他端２１ｂ側にオフセットした位置には、基部２１の中心線Ｘ方向から見てリング状を成すフランジ部２１１が、基部２１の外周縁の全周に亘って設けられている。
支持部材２は、フランジ部２１１を、オイルパン８０の底壁部８０ａに当接させて設けられており、フランジ部２１１の外周縁は、全周に亘って底壁部８０ａに溶接されている。
The support member 2 has a cylindrical base portion 21, and one end 21 a of the base portion 21 penetrates the bottom wall portion 80 a and is located outside the oil pan 80.
At a position offset from the one end 21 a of the base portion 21 to the other end 21 b side, a flange portion 211 having a ring shape when viewed from the center line X direction of the base portion 21 is provided over the entire outer periphery of the base portion 21. Yes.
The support member 2 is provided with the flange portion 211 in contact with the bottom wall portion 80a of the oil pan 80, and the outer peripheral edge of the flange portion 211 is welded to the bottom wall portion 80a over the entire circumference. .
支持部材２の内部には、オイルパン８０の内部空間Ｓ＿ｉｎと外部空間Ｓ＿ｏｕｔとを連通させる連通孔２３が形成されており、この連通孔２３は、基部２１の一端２１ａから他端２１ｂまで貫通して設けられている。
図１の（ａ）、（ｂ）に示すように、連通孔２３は、オイルパン８０の内部空間Ｓ＿ｉｎに開口する小径孔部２３１と、オイルパン８０の外部空間Ｓ＿ｏｕｔに開口する大径孔部２３２とから構成されており、これら小径孔部２３１と大径孔部２３２は、基部２１の中心線Ｘ上で同心に設けられている。
A communication hole 23 is formed in the support member 2 to communicate the internal space S_in and the external space S_out of the oil pan 80. The communication hole 23 penetrates from one end 21a of the base 21 to the other end 21b. Is provided.
As shown in FIGS. 1A and 1B, the communication hole 23 includes a small-diameter hole portion 231 that opens into the internal space S_in of the oil pan 80 and a large-diameter hole portion that opens into the external space S_out of the oil pan 80. The small-diameter hole portion 231 and the large-diameter hole portion 232 are provided concentrically on the center line X of the base portion 21.
図１の（ｃ）に示すように、大径孔部２３２では、基部２１の一端２１ａから他端２１ｂ側の所定範囲の内周に、ボルトＢが螺入される雌ネジ２３２ａが設けられており、オイルパン８０の外部に開口する大径孔部２３２の開口が、大径孔部２３２に螺入したボルトＢにより封止されるようになっている。
実施の形態では、大径孔部２３２の開口をボルトＢで封止した際に、基部２１の一端２１ａとボルトＢの頭部Ｂ１との間にリング状のシール部材Ｓが把持されて、大径孔部２３２からのオイルの漏出がより確実に阻止されるようになっている。
As shown in FIG. 1C, the large-diameter hole portion 232 is provided with a female screw 232a into which a bolt B is screwed on the inner periphery of a predetermined range from the one end 21a to the other end 21b of the base portion 21. The opening of the large-diameter hole portion 232 that opens to the outside of the oil pan 80 is sealed with a bolt B screwed into the large-diameter hole portion 232.
In the embodiment, when the opening of the large-diameter hole 232 is sealed with the bolt B, the ring-shaped seal member S is gripped between the one end 21a of the base 21 and the head B1 of the bolt B, and the large Oil leakage from the diameter hole 232 is more reliably prevented.
小径孔部２３１は、基部２１の中心線Ｘ上で大径孔部２３２に隣接して設けられており、この小径孔部２３１の内周には、筒状部材３の雄ネジ３２ａが螺合する雌ネジ２３１ａが、中心線Ｘ方向の全長に亘って設けられている。 The small diameter hole portion 231 is provided adjacent to the large diameter hole portion 232 on the center line X of the base portion 21, and the male screw 32 a of the cylindrical member 3 is screwed into the inner periphery of the small diameter hole portion 231. The female screw 231a is provided over the entire length in the center line X direction.
筒状部材３は、円筒状の基部３１の一端３１ａ側に、小径孔部２３１の内径と整合する外径Ｄ１の係合部３２を有しており、この係合部３２の外周に雄ネジ３２ａが形成されている。 The cylindrical member 3 has an engagement portion 32 having an outer diameter D1 that matches the inner diameter of the small-diameter hole portion 231 on the one end 31a side of the cylindrical base portion 31, and a male screw is provided on the outer periphery of the engagement portion 32. 32a is formed.
この係合部３２の一端３１ａ側に隣接する位置には、基部３１の長手方向の所定範囲を中心線Ｘの径方向外側に膨出させて形成したビード加工部３３が設けられている。
このビード加工部３３は、中心線Ｘ周りの周方向の全周に亘って設けられており、係合部３２の外径Ｄ１よりも小さい外径Ｄ２で形成されている。
基部３１を一端３１ａから他端３１ｂまで貫通する貫通孔３４では、ビード加工部３３が設けられた領域の最大の内径Ｄｂが、貫通孔３４の他の領域の内径Ｄａよりも大きくなっており、基部３１を中心線Ｘ方向に圧縮する応力が作用すると、ビード加工部３３の部分が、中心線Ｘ方向に座屈しつつ、外径が広がるようになっている。
A bead processing portion 33 formed by bulging a predetermined range in the longitudinal direction of the base portion 31 outward in the radial direction of the center line X is provided at a position adjacent to the one end 31 a side of the engaging portion 32.
The bead processing portion 33 is provided over the entire circumference in the circumferential direction around the center line X, and is formed with an outer diameter D2 that is smaller than the outer diameter D1 of the engagement portion 32.
In the through hole 34 penetrating the base 31 from one end 31a to the other end 31b, the maximum inner diameter Db of the region where the bead processing portion 33 is provided is larger than the inner diameter Da of the other region of the through hole 34, When a stress that compresses the base portion 31 in the direction of the center line X is applied, the bead processed portion 33 is buckled in the direction of the center line X, and the outer diameter increases.
実施の形態では、筒状部材３の長手方向におけるビード加工部３３の一方の起点３３ａと、他方の起点３３ｂとが、中心線Ｘ方向で略接触するまで、ビード加工部３３が座屈すると、座屈後のビード加工部３３Ａの外径Ｄ３が、係合部３２の外径Ｄ１（小径孔部２３１の内径）よりも多くなるように、座屈前のビード加工部３３の中心線Ｘ方向の長さＬ１が設定されている。 In the embodiment, when the bead processing portion 33 buckles until one start point 33a of the bead processing portion 33 in the longitudinal direction of the tubular member 3 and the other start point 33b substantially contact with each other in the center line X direction, The center line X direction of the bead processed portion 33 before buckling so that the outer diameter D3 of the bead processed portion 33A after buckling is larger than the outer diameter D1 of the engaging portion 32 (the inner diameter of the small diameter hole portion 231). The length L1 is set.
さらに、筒状部材３は、基部３１の一端３１ａから、座屈後のビード加工部３３の起点３３ａまでの長さＬ２が、連通孔２３を封止したボルトＢの軸部Ｂ２と、小径孔部２３１と大径孔部２３２との境界の段部２３３との間の離間距離Ｌ３と略整合する長さに設定されている。 Further, the cylindrical member 3 has a length L2 from one end 31a of the base portion 31 to the starting point 33a of the bead processing portion 33 after buckling, and a shaft portion B2 of the bolt B sealing the communication hole 23, and a small diameter hole. The length is set so as to substantially match the separation distance L3 between the step 233 at the boundary between the portion 231 and the large-diameter hole 232.
筒状部材３の一端３１ａには、中心線Ｘの直交方向における貫通孔３４の断面形状が、多角形形状（例えば、６角形形状）に形成された被係合部３４１が設けられている。
そのため、被係合部３４１の断面形状と整合する外径の柱状部材Ｔ（例えば、六角レンチ）を、筒状部材３の他端３１ｂ側から挿入して被係合部３４１に係合させたのち、柱状部材Ｔ（図２参照）を中心線Ｘ回りに回転させると、筒状部材３を中心線Ｘ回りに回転させることができるようになっている。
At one end 31 a of the cylindrical member 3, an engaged portion 341 is provided in which the cross-sectional shape of the through hole 34 in the direction orthogonal to the center line X is a polygonal shape (for example, a hexagonal shape).
Therefore, a columnar member T (for example, a hexagon wrench) having an outer diameter that matches the cross-sectional shape of the engaged portion 341 is inserted from the other end 31b side of the cylindrical member 3 and engaged with the engaged portion 341. After that, when the columnar member T (see FIG. 2) is rotated about the center line X, the cylindrical member 3 can be rotated about the center line X.
前記したように、筒状部材３の一端３１ａ側の係合部３２には、支持部材２の小径孔部２３１の雌ネジ２３１ａに螺合する雄ネジ３２ａが設けられている。
そのため、柱状部材Ｔにより、筒状部材３を中心線Ｘ回りに回転させることで、筒状部材３の係合部３２を支持部材２の小径孔部２３１に螺入させて、筒状部材３を支持部材２に取り付けることができるようになっている。
As described above, the engagement portion 32 on the one end 31 a side of the cylindrical member 3 is provided with the male screw 32 a that is screwed into the female screw 231 a of the small diameter hole portion 231 of the support member 2.
Therefore, by rotating the cylindrical member 3 around the center line X by the columnar member T, the engaging portion 32 of the cylindrical member 3 is screwed into the small-diameter hole portion 231 of the support member 2, and the cylindrical member 3. Can be attached to the support member 2.
［オーバーフローチューブの組付け］
以下、かかる構成のオーバーフローチューブ１の組付けを説明する。
図２および図３は、オーバーフローチューブ１の組付けを説明する図である。
図２の（ａ）は、オイルパン８０の底壁部８０ａに固定された支持部材２に、筒状部材３を挿入する前の状態を示す図である。
図２の（ｂ）は、係合部３２が、支持部材２の小径孔部２３１の上端に当接する位置まで、筒状部材３の一端３１ａ側を、支持部材２の連通孔２３に挿入した状態を示す図である。
図２の（ｃ）は、筒状部材３の他端３１ｂ側から柱状部材Ｔを挿入している途中を示す図である。
図２の（ｄ）は、柱状部材Ｔの係合部Ｔ１を、筒状部材３の被係合部３４１に係合させた状態で、筒状部材３を中心線Ｘ回りに回転させて、筒状部材３の一端３１ａがボルトＢの軸部Ｂ２に当接する位置まで、筒状部材３の係合部３２を支持部材２の小径孔部２３１に螺入した状態を示す図である。
[Assembly of overflow tube]
Hereinafter, assembly of the overflow tube 1 having such a configuration will be described.
2 and 3 are views for explaining the assembly of the overflow tube 1.
2A is a view showing a state before the cylindrical member 3 is inserted into the support member 2 fixed to the bottom wall portion 80a of the oil pan 80. FIG.
2B, the one end 31a side of the cylindrical member 3 is inserted into the communication hole 23 of the support member 2 until the engaging portion 32 comes into contact with the upper end of the small-diameter hole portion 231 of the support member 2. It is a figure which shows a state.
FIG. 2C is a diagram showing a state in which the columnar member T is being inserted from the other end 31 b side of the cylindrical member 3.
(D) of FIG. 2 rotates the cylindrical member 3 around the center line X in a state where the engaging portion T1 of the columnar member T is engaged with the engaged portion 341 of the cylindrical member 3, FIG. 4 is a view showing a state in which the engaging portion 32 of the cylindrical member 3 is screwed into the small diameter hole portion 231 of the supporting member 2 until the end 31a of the cylindrical member 3 contacts the shaft portion B2 of the bolt B.
図３の（ａ）は、図２の（ｄ）の状態から、筒状部材３の係合部３２を支持部材２の小径孔部２３１にさらに螺入して、筒状部材３のビード加工部３３を座屈させている途中の状態を示す図である。
図３の（ｂ）は、（ａ）の状態から、筒状部材３のビード加工部３３が完全に座屈するまで、筒状部材３の係合部３２を支持部材２の小径孔部２３１に螺入した状態を示す図である。
図３の（ｃ）は、（ａ）における領域Ａの拡大図であり、（ｄ）は、（ｂ）における領域Ｂの拡大図であり、（ｅ）は、変形例に係るビート加工部３３Ｂを示した図である。
3 (a) shows a bead process of the cylindrical member 3 by further screwing the engaging portion 32 of the cylindrical member 3 into the small diameter hole portion 231 of the supporting member 2 from the state of FIG. 2 (d). It is a figure which shows the state in the middle of buckling the part 33. FIG.
3B, the engaging portion 32 of the cylindrical member 3 is changed from the state of FIG. 3A to the small diameter hole portion 231 of the supporting member 2 until the bead processing portion 33 of the cylindrical member 3 is completely buckled. It is a figure which shows the state screwed.
3C is an enlarged view of the region A in FIG. 3A, FIG. 3D is an enlarged view of the region B in FIG. 3B, and FIG. 3E is a beat processing portion 33B according to the modification. FIG.
自動変速機の組付けラインでは、連通孔２３（大径孔部２３２）の開口がボルトＢで封止された支持部材２が、オイルパン８０の底壁部８０ａに溶接された状態で、オーバーフローチューブ１の組付け工程に供給される（図２の（ａ）参照）。
そのため、オーバーフローチューブ１の組付け工程では、当該工程に用意された筒状部材３を、支持部材２に対して組付ける作業を行うようになっており、筒状部材３は、基部３１の一端３１ａ側から、支持部材２の小径孔部２３１に挿入される。
この際に、支持部材２の連通孔２３を封止するボルトＢを、支持部材２から取り外すことなく、筒状部材３の支持部材２に対する組付けを行えるようになっている。
In the assembly line of the automatic transmission, overflow occurs in the state where the support member 2 whose opening of the communication hole 23 (large diameter hole portion 232) is sealed with the bolt B is welded to the bottom wall portion 80a of the oil pan 80. The tube 1 is supplied to the assembly process (see FIG. 2A).
Therefore, in the assembly process of the overflow tube 1, the cylindrical member 3 prepared in the process is assembled to the support member 2, and the cylindrical member 3 is one end of the base portion 31. The small diameter hole portion 231 of the support member 2 is inserted from the 31a side.
At this time, the bolt B that seals the communication hole 23 of the support member 2 can be assembled to the support member 2 without removing the bolt B from the support member 2.
ここで、筒状部材３のビード加工部３３は、筒状部材３の係合部３２の外径Ｄ１よりも小さい外径Ｄ２（図１の（ｄ）参照）で形成されており、筒状部材３の係合部３２は、小径孔部２３１（図１の（ｂ）参照）に螺合可能な外径を有している。
そのため、筒状部材３の一端３１ａ側を、小径孔部２３１に挿入すると、係合部３２の外周の雄ネジ３２ａが、小径孔部２３１の内周の雌ネジ２３１ａの上端に当接する位置まで、筒状部材３の一端３１ａ側が小径孔部２３１に挿入されることになる（図２の（ｂ）参照）。
さらに、この筒状部材３の小径孔部２３１への挿入の際に、ビード加工部３３が小径孔部２３１の内周（雌ネジ２３１ａ）と干渉して、この筒状部材３の小径孔部２３１への挿入が阻害されないようになっている。
Here, the bead processing part 33 of the cylindrical member 3 is formed with an outer diameter D2 (see FIG. 1D) smaller than the outer diameter D1 of the engaging part 32 of the cylindrical member 3, and is cylindrical. The engaging portion 32 of the member 3 has an outer diameter that can be screwed into the small diameter hole portion 231 (see FIG. 1B).
Therefore, when one end 31 a side of the cylindrical member 3 is inserted into the small diameter hole portion 231, the male screw 32 a on the outer periphery of the engagement portion 32 reaches a position where it abuts on the upper end of the internal screw 231 a on the inner periphery of the small diameter hole portion 231. The one end 31a side of the cylindrical member 3 is inserted into the small diameter hole portion 231 (see FIG. 2B).
Further, when the cylindrical member 3 is inserted into the small-diameter hole portion 231, the bead processing portion 33 interferes with the inner periphery (internal thread 231 a) of the small-diameter hole portion 231, and the small-diameter hole portion of the cylindrical member 3 Insertion into 231 is not inhibited.
続いて、筒状部材３の一端３１ａ側の被係合部３４１の断面形状と整合する外形の柱状部材Ｔ（例えば、六角レンチ）を、筒状部材３の被係合部３４１に係合させるために、柱状部材Ｔの係合部Ｔ１側を、筒状部材３の他端３１ｂ側の開口から貫通孔３４内に挿入する（図２の（ｃ）参照）。 Subsequently, a columnar member T (for example, a hexagon wrench) having an outer shape that matches the cross-sectional shape of the engaged portion 341 on the one end 31 a side of the cylindrical member 3 is engaged with the engaged portion 341 of the cylindrical member 3. Therefore, the engaging portion T1 side of the columnar member T is inserted into the through hole 34 from the opening on the other end 31b side of the cylindrical member 3 (see FIG. 2C).
そして、柱状部材Ｔの係合部Ｔ１を筒状部材３の被係合部３４１に係合させたのち、柱状部材Ｔを中心線Ｘ回りに回転させて、筒状部材３の係合部３２を小径孔部２３１に螺入すると、筒状部材３の一端３１ａが、ボルトＢの軸部Ｂ２の先端Ｂ２ａに当接する位置に到達することになる（図２の（ｄ）参照）。 Then, after engaging the engaging portion T1 of the columnar member T with the engaged portion 341 of the cylindrical member 3, the columnar member T is rotated about the center line X, and the engaging portion 32 of the cylindrical member 3 is rotated. Is screwed into the small-diameter hole 231, the one end 31 a of the cylindrical member 3 reaches a position where it abuts on the tip B 2 a of the shaft B 2 of the bolt B (see FIG. 2D).
そうすると、筒状部材３の一端３１ａがボルトＢの軸部Ｂ２に当接して、係合部３２の小径孔部２３１への螺入が阻害されるので、係合部３２を小径孔部２３１に螺入するために柱状部材Ｔを回転させていた作業者は、それまで柱状部材Ｔに作用させていた回転力（トルク）では、係合部３２を小径孔部２３１に螺入できなくなることにより、筒状部材３の一端３１ａがボルトＢの軸部Ｂ２に当接したことを感覚的に認識できるようになっている。 Then, the one end 31a of the cylindrical member 3 comes into contact with the shaft portion B2 of the bolt B, and the screwing of the engaging portion 32 into the small diameter hole portion 231 is hindered, so that the engaging portion 32 becomes the small diameter hole portion 231. An operator who has rotated the columnar member T for screwing can no longer screw the engaging portion 32 into the small-diameter hole portion 231 with the rotational force (torque) that has been applied to the columnar member T until then. The one end 31a of the cylindrical member 3 can be sensibly recognized that the shaft B2 of the bolt B is in contact.
図２の（ｄ）の状態から、柱状部材Ｔに作用させる回転力（トルク）をさらに大きくすると、筒状部材３の係合部３２には、筒状部材３を小径孔部２３１内に挿入させる方向（図中矢印参照）の力が作用することになる。
ここで、筒状部材３を小径孔部２３１内に挿入させる方向の移動は、ボルトＢの軸部Ｂ２に当接した筒状部材３の一端３１ａにより阻止されているので、筒状部材３は、剛性強度が他の部分よりも弱いビード加工部３３を中心線Ｘ方向に座屈させながら移動することになる（図３の（ａ）、（ｃ）参照）。
If the rotational force (torque) applied to the columnar member T is further increased from the state of FIG. 2D, the cylindrical member 3 is inserted into the small diameter hole 231 in the engaging portion 32 of the cylindrical member 3. The force in the direction (see the arrow in the figure) is applied.
Here, the movement in the direction in which the cylindrical member 3 is inserted into the small-diameter hole 231 is prevented by the one end 31a of the cylindrical member 3 that is in contact with the shaft B2 of the bolt B. Then, the bead processed portion 33 whose rigidity strength is weaker than other portions is moved while buckling in the direction of the center line X (see FIGS. 3A and 3C).
これにより、ビード加工部３３は、中心線Ｘ方向の起点３３ａ、３３ｂを互いに近づける方向に座屈しつつ、外径が広がることになる（図３の（ｂ）、（ｄ））。
実施の形態では、座屈後のビード加工部３３Ａの外径Ｄ３が、係合部３２の外径Ｄ１よりも広くなるように、座屈する前の中心線Ｘ方向のビード加工部３３の長さＬ１が設定されている（図１の（ｄ）参照）。
As a result, the bead processed portion 33 is buckled in the direction in which the starting points 33a and 33b in the center line X direction are brought closer to each other, and the outer diameter is widened ((b) and (d) in FIG. 3).
In the embodiment, the length of the bead processing portion 33 in the center line X direction before buckling so that the outer diameter D3 of the bead processing portion 33A after buckling is larger than the outer diameter D1 of the engagement portion 32. L1 is set (see (d) of FIG. 1).
従って、ビード加工部３３を座屈させた後の状態では、振動などにより、筒状部材３が回転しても、小径孔部２３１から外れる方向への移動が、小径孔部２３１と大径孔部２３２との境界の段部２３３に、座屈後のビード加工部３３Ａが干渉することで阻止されるようになっている。
さらに、筒状部材３の一端３１ａをボルトＢの軸部Ｂ２に当接させた状態で、ビード加工部３３を座屈させているので、ビード加工部３３Ａを座屈させた後の筒状部材３のガタツキが生じないようにされている。
Therefore, in the state after the bead processing portion 33 is buckled, even if the cylindrical member 3 rotates due to vibration or the like, the movement in the direction away from the small-diameter hole portion 231 causes the small-diameter hole portion 231 and the large-diameter hole to move. The bead processing part 33A after buckling interferes with the step part 233 at the boundary with the part 232 so as to be prevented.
Further, since the bead processing portion 33 is buckled in a state where the one end 31a of the cylindrical member 3 is in contact with the shaft portion B2 of the bolt B, the cylindrical member after the bead processing portion 33A is buckled. 3 is not generated.
以上の通り、実施の形態では
（１）オイルパン８０に設けられた支持部材２と、
支持部材２に設けられていると共に、オイルパン８０の内部と外部を連通させる連通孔２３と、
連通孔２３の開口をオイルパン８０の外部（外部空間Ｓ＿ｏｕｔ）から封止するボルトＢ（封止部材）と、
長手方向の一端３１ａ側が、オイルパン８０の内部（内部空間Ｓ＿ｉｎ）側から連通孔２３に挿入されて、一端３１ａが連通孔２３の内部でボルトＢの軸部Ｂ２に当接して位置決めされると共に、連通孔２３の外部に位置する他端３１ｂが、オイルパン８０内の所定位置に配置された筒状部材３と、を有するオーバーフローチューブ１であって、
筒状部材３では、
長手方向の一端３１ａ側に設けた係合部３２（大径部）の外周に、連通孔２３の内周の雌ネジ２３１ａ（ネジ部）に螺合する雄ネジ３２ａ（ネジ部）が設けられていると共に、
係合部３２の一端３１ａ側に隣接して、長手方向に圧縮された際に拡径するビード加工部３３が、係合部３２の外径Ｄ１よりも小さい外径Ｄ２で設けられており、
ビード加工部３３の拡径後の外径Ｄ３を、係合部３２よりも大きい外径に設定した構成のオーバーフローチューブ１とした。
As described above, in the embodiment (1) the support member 2 provided in the oil pan 80,
A communication hole 23 provided in the support member 2 and communicating the inside and the outside of the oil pan 80;
A bolt B (sealing member) that seals the opening of the communication hole 23 from the outside of the oil pan 80 (external space S_out);
One end 31a in the longitudinal direction is inserted into the communication hole 23 from the inside (internal space S_in) side of the oil pan 80, and one end 31a is positioned in contact with the shaft portion B2 of the bolt B inside the communication hole 23. The other end 31b located outside the communication hole 23 is a tubular member 3 disposed at a predetermined position in the oil pan 80.
In the cylindrical member 3,
On the outer periphery of the engaging portion 32 (large diameter portion) provided on the one end 31a side in the longitudinal direction, a male screw 32a (screw portion) that is screwed into the female screw 231a (screw portion) on the inner periphery of the communication hole 23 is provided. And
Adjacent to the one end 31a side of the engaging portion 32, a bead processing portion 33 whose diameter is increased when compressed in the longitudinal direction is provided with an outer diameter D2 smaller than the outer diameter D1 of the engaging portion 32,
The overflow tube 1 having a configuration in which the outer diameter D3 of the bead processed portion 33 after being expanded is set to be larger than the engaging portion 32 is used.
このように構成すると、筒状部材３の一端３１ａがボルトＢの軸部Ｂ２に当接する位置まで、オイルパン８０の内側から筒状部材３を連通孔２３に螺入したのち、筒状部材３を連通孔２３にさらに螺入すると、ビード加工部３３が、筒状部材３の長手方向に圧縮されて、係合部３２の外径Ｄ１よりも大きい外径Ｄ３まで拡径する。
これにより、拡径したビード加工部３３Ａが連通孔２３の内周の雌ネジ２３１ａと干渉して、筒状部材３を連通孔２３からオイルパン８０の内側に引き抜く方向への移動が規制されるので、筒状部材３を支持部材２に対して組付ける際に、支持部材２からのボルトＢの取り外し作業と、支持部材２へのボルトＢの取り付け作業とを行う必要がない。
よって、オーバーフローチューブ１の組付け工程における作業工数が少なくなるので、より簡単にオーバーフローチューブ１の組付けを行えることになり、作業工数が少なくなった分だけ、作業コストの低減が期待できる。
With this configuration, the cylindrical member 3 is screwed into the communication hole 23 from the inside of the oil pan 80 until the one end 31a of the cylindrical member 3 comes into contact with the shaft portion B2 of the bolt B. Is further screwed into the communication hole 23, the bead processing portion 33 is compressed in the longitudinal direction of the tubular member 3 and is expanded to an outer diameter D3 larger than the outer diameter D1 of the engaging portion 32.
As a result, the expanded bead processing portion 33A interferes with the internal thread 231a on the inner periphery of the communication hole 23, and movement in the direction of pulling the tubular member 3 from the communication hole 23 to the inside of the oil pan 80 is restricted. Therefore, when the tubular member 3 is assembled to the support member 2, it is not necessary to perform the operation of removing the bolt B from the support member 2 and the operation of attaching the bolt B to the support member 2.
Therefore, since the work man-hour in the assembly process of the overflow tube 1 is reduced, the overflow tube 1 can be assembled more easily, and the work cost can be expected to be reduced as much as the work man-hour is reduced.
（２）連通孔２３は、
オイルパン８０の内部空間Ｓ＿ｉｎに開口する小径孔部２３１と、オイルパン８０の外部空間Ｓ＿ｏｕｔに開口する大径孔部２３２と、から構成されており、
筒状部材３は、小径孔部２３１の内周の雌ネジ２３１ａ（ネジ部）に、係合部３２の外周の雄ネジ３２ａ（ネジ部）を螺合して設けられており、
ビード加工部３３の拡径後の外径Ｄ３を、小径孔部２３１の内径よりも大きい外径に設定した構成とした。
(2) The communication hole 23 is
A small-diameter hole portion 231 that opens into the internal space S_in of the oil pan 80, and a large-diameter hole portion 232 that opens into the external space S_out of the oil pan 80.
The tubular member 3 is provided by screwing a male screw 32a (screw portion) on the outer periphery of the engaging portion 32 to a female screw 231a (screw portion) on the inner periphery of the small diameter hole portion 231.
The outer diameter D3 of the bead processed portion 33 after being expanded is set to an outer diameter larger than the inner diameter of the small-diameter hole portion 231.
このように構成すると、拡径したビード加工部３３Ａが、小径孔部２３１と大径孔部２３２の境界の段部２３３と干渉して、筒状部材３を連通孔２３からオイルパン８０の内側に引き抜く方向への移動が規制されるので、筒状部材３を支持部材２に対して組付ける際に、支持部材２からのボルトＢの取り外し作業と、支持部材２へのボルトＢの取り付け作業とを行う必要がない。
よって、オーバーフローチューブ１の組付け工程における作業工数が少なくなるので、より簡単にオーバーフローチューブ１の組付けを行えることになり、作業工数が少なくなった分だけ、作業コストの低減が期待できる。
With this configuration, the bead processed portion 33A having an enlarged diameter interferes with the step portion 233 at the boundary between the small diameter hole portion 231 and the large diameter hole portion 232, and the tubular member 3 is moved from the communication hole 23 to the inside of the oil pan 80. Therefore, when the tubular member 3 is assembled to the support member 2, the operation of removing the bolt B from the support member 2 and the operation of attaching the bolt B to the support member 2 are restricted. There is no need to do.
Therefore, since the work man-hour in the assembly process of the overflow tube 1 is reduced, the overflow tube 1 can be assembled more easily, and the work cost can be expected to be reduced as much as the work man-hour is reduced.
（３）筒状部材３の内部を長手方向の一端３１ａから他端３１ｂまで貫通する貫通孔３４では、一端３１ａ側の所定範囲の断面形状が、多角形形状を有している構成とした。 (3) In the through hole 34 penetrating the inside of the cylindrical member 3 from the one end 31a to the other end 31b in the longitudinal direction, the cross-sectional shape in a predetermined range on the one end 31a side has a polygonal shape.
このように構成すると、被係合部３４１の断面形状と整合する外径の柱状部材Ｔ（例えば、六角レンチ）を、筒状部材３の他端３１ｂ側から挿入して被係合部３４１に係合させたのち、柱状部材Ｔ（図２参照）を中心線Ｘ回りに回転させると、筒状部材３を中心線Ｘ回りに回転させて、係合部３２の外周の雄ネジ３２ａを、小径孔部２３１の雌ネジ２３１ａに螺合して、支持部材２に筒状部材３を組付けることができる。 If comprised in this way, the columnar member T (for example, hexagon wrench) of the outer diameter which matches the cross-sectional shape of the to-be-engaged part 341 will be inserted in the to-be-engaged part 341 from the other end 31b side of the cylindrical member 3. After the engagement, when the columnar member T (see FIG. 2) is rotated around the center line X, the cylindrical member 3 is rotated around the center line X, and the male screw 32a on the outer periphery of the engaging portion 32 is The cylindrical member 3 can be assembled to the support member 2 by screwing into the female screw 231 a of the small diameter hole portion 231.
これにより、筒状部材３を支持部材２に組付ける際に、支持部材２の連通孔２３（大径孔部２３２）の開口を封止するボルトＢを、取り外す必要がないので、支持部材２の組付けに際し、ボルトＢの取り外し作業と、支持部材２へのボルトＢの取り付け作業とが必要ないので、これらの作業分だけ、オーバーフローチューブ１の組付け工程における作業工数が少なくなる。
よって、より簡単にオーバーフローチューブ１の組付けを行えると共に、従来のオーバーフローチューブの場合に比べて、作業工数が少なくなるので、その分だけ、作業コストの低減が期待できる。
Thereby, when the cylindrical member 3 is assembled to the support member 2, it is not necessary to remove the bolt B that seals the opening of the communication hole 23 (large diameter hole portion 232) of the support member 2. At the time of assembling, the work of removing the bolt B and the work of attaching the bolt B to the support member 2 are not required, so that the number of work steps in the assembly process of the overflow tube 1 is reduced by these work.
Therefore, the overflow tube 1 can be assembled more easily, and the number of work steps can be reduced as compared with the case of the conventional overflow tube, so that the work cost can be expected to be reduced accordingly.
前記した実施の形態では、拡径後のビード加工部３３Ａの外径Ｄ３を、係合部３２よりも大きい外径に設定した場合を例示したが、図３の（ｅ）に示すように、拡径後のビード加工部３３Ｂの外径を、大径孔部２３２の内径Ｄ４よりも僅かに大きい外径に設定しても良い。 In the above-described embodiment, the case where the outer diameter D3 of the bead processed portion 33A after the diameter expansion is set to an outer diameter larger than that of the engaging portion 32 is illustrated, but as shown in FIG. You may set the outer diameter of the bead process part 33B after diameter expansion to an outer diameter slightly larger than the internal diameter D4 of the large diameter hole part 232. FIG.
すなわち、
（４）拡径後のビード加工部３３Ｂの外径は、大径孔部２３２の内径Ｄ４よりも僅かに大きい外径に設定して、座屈して拡径したビード加工部３３Ｂを、大径孔部２３２の内周に圧接させる構成とした。
That is,
(4) The outer diameter of the bead processed portion 33B after the diameter expansion is set to an outer diameter slightly larger than the inner diameter D4 of the large diameter hole portion 232, and the bead processed portion 33B that has been buckled and expanded in diameter has a large diameter. The configuration is such that the inner periphery of the hole 232 is pressed.
このように構成すると、拡径後のビード加工部３３Ａの外周縁が、大径孔部２３２の内周に全面に亘って圧接するので、この圧接力により、組付け後の筒状部材３のガタツキを好適に防止できる。 If comprised in this way, since the outer periphery of the bead processing part 33A after diameter expansion will press-contact over the inner periphery of the large diameter hole part 232 over the whole surface, this press contact force of the cylindrical member 3 after an assembly | attachment Backlash can be suitably prevented.
１ オーバーフローチューブ
２ 支持部材
２１ 基部
２１ａ 一端
２１ｂ 他端
２１１ フランジ部
２３ 連通孔
２３１ 小径孔部
２３１ａ 雌ネジ
２３２ 大径孔部
２３２ａ 雌ネジ
２３３ 段部
３ 筒状部材
３１ 基部
３１ａ 一端
３１ｂ 他端
３２ 係合部
３２ａ 雄ネジ
３３ ビード加工部
３３Ａ 座屈した（拡径した）ビード加工部
３３ａ 起点
３３ｂ 起点
３４ 貫通孔
３４１ 被係合部
８０ オイルパン
８０ａ 底壁部
１００ 変速機ケース
１０１ オイルパン
１１０ オーバーフローチューブ
Ｂ ボルト
Ｂ１ 頭部
Ｂ２ 軸部
Ｓ＿ｉｎ 内部空間
Ｓ＿ｏｕｔ 外部空間
Ｓ シール部材
Ｔ 柱状部材
Ｔ１ 係合部
Ｘ 中心線
DESCRIPTION OF SYMBOLS 1 Overflow tube 2 Support member 21 Base part 21a One end 21b Other end 211 Flange part 23 Communication hole 231 Small diameter hole part 231a Female screw 232 Large diameter hole part 232a Female screw 233 Step part 3 Cylindrical member 31 Base part 31a One end 31b Other end 32 Joint portion 32a Male thread 33 Bead processing portion 33A Buckled (expanded) bead processing portion 33a Starting point 33b Starting point 34 Through hole 341 Engaged portion 80 Oil pan 80a Bottom wall portion 100 Transmission case 101 Oil pan 110 Overflow tube B Bolt B1 Head B2 Shaft S_in Internal space S_out External space S Seal member T Columnar member T1 Engagement part X Center line
Claims (4)
前記支持部材に設けられていると共に、前記オイルパンの内部と外部を連通させる連通孔と、
前記連通孔の開口を前記オイルパンの外部から封止する封止部材と、
長手方向の一端側が、前記オイルパンの内部側から前記連通孔に挿入されて、前記一端が前記連通孔の内部で前記封止部材に当接して位置決めされると共に、前記連通孔の外部に位置する他端が、前記オイルパン内の所定位置に配置された筒状部材と、を有するオーバーフローチューブであって、
前記筒状部材では、
前記長手方向の一端側に設けた大径部の外周に、前記連通孔の内周のネジ部に螺合するネジ部が設けられていると共に、
前記大径部の前記一端側に隣接して、前記長手方向に圧縮された際に拡径するビード加工部が、前記大径部よりも小さい外径で設けられており、
前記ビード加工部の前記拡径後の外径を、前記大径部よりも大きい外径に設定したことを特徴とするオーバーフローチューブ。 A support member provided on the oil pan;
A communication hole provided in the support member and communicating between the inside and the outside of the oil pan;
A sealing member for sealing the opening of the communication hole from the outside of the oil pan;
One end side in the longitudinal direction is inserted into the communication hole from the inner side of the oil pan, the one end is positioned in contact with the sealing member inside the communication hole, and is positioned outside the communication hole. The other end to be an overflow tube having a cylindrical member disposed at a predetermined position in the oil pan,
In the tubular member,
On the outer periphery of the large-diameter portion provided on one end side in the longitudinal direction, a screw portion that is screwed into the inner peripheral screw portion of the communication hole is provided,
Adjacent to the one end side of the large-diameter portion, a bead processing portion that expands in diameter when compressed in the longitudinal direction is provided with an outer diameter smaller than the large-diameter portion,
An overflow tube, wherein an outer diameter of the bead processed portion after the diameter expansion is set to an outer diameter larger than that of the large diameter portion.
前記オイルパンの内部に開口する小径孔部と、前記オイルパンの外部に開口する大径孔部と、から構成されており、
前記筒状部材は、前記小径孔部の内周のネジ部に、前記大径部の外周のネジ部を螺合して設けられており、
前記ビード加工部の前記拡径後の外径を、前記小径孔部の内径よりも大きい外径に設定したことを特徴とする請求項１に記載のオーバーフローチューブ。 The communication hole is
A small-diameter hole opening inside the oil pan, and a large-diameter hole opening outside the oil pan,
The cylindrical member is provided by screwing the outer peripheral thread portion of the large diameter portion into the inner peripheral thread portion of the small diameter hole portion,
The overflow tube according to claim 1, wherein an outer diameter of the bead-processed portion after the diameter expansion is set to an outer diameter larger than an inner diameter of the small-diameter hole portion.
前記オイルパンの内部に開口する小径孔部と、前記オイルパンの外部に開口する大径孔部と、から構成されており、
前記筒状部材は、前記小径孔部の内周のネジ部に、前記大径部の外周のネジ部を螺合して設けられており、
前記ビード加工部の前記拡径後の外径は、前記大径孔部の内径よりも僅かに大きい外径に設定されていることを特徴とする請求項１に記載のオーバーフローチューブ。 The communication hole is
A small-diameter hole opening inside the oil pan, and a large-diameter hole opening outside the oil pan,
The cylindrical member is provided by screwing the outer peripheral thread portion of the large diameter portion into the inner peripheral thread portion of the small diameter hole portion,
2. The overflow tube according to claim 1, wherein an outer diameter of the bead processed portion after the diameter expansion is set to an outer diameter slightly larger than an inner diameter of the large-diameter hole portion.
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| JP2015145633A JP6456259B2 (en) | 2015-07-23 | 2015-07-23 | Overflow tube |
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